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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d078ae3d576363ceb6c0585f9639e681f852e94f2cb8cc7fc2da47d4e8ece0' 
  AND token = 'E1kbFtuvFBkGR8tlETexPxDmb15FPMf/0qskOAm9MX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}