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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b26b311b2e0ad1304fde0bb62e187a88e6dd7ccd466ebb1b14d6da9e40b69f' 
  AND token = 'WH5n0VXTzm0OXrQaxAqlG4RXLOmO8InHEV6Ja1Tj4jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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