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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58e05400d5ff25dfbeef128328ad3d9ec41cc60f115f65c05c2417c3db6e44da' 
  AND token = 'S9otZfo5B2oJAr/87x1rgRU64GnJtfZOx0SJlBkgmMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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