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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fcbd85fac73da5b8997b5e3a7a198aaf15805eea4010b0b7d94532281d00ff' 
  AND token = '+sSeibZwGmE3Oriz6OOHJ3iKV0qx7JMJtdJwVmg7x9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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