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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30018b276da8141ac4858b1a79da3483f865bd66af02d3901d616f65086c063a' 
  AND token = 'Agaz9AXcUzs010wwgkUVwv4asbg8Y6hEDDxuvOE428c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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