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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243672dc8c5d68c62180de4f84380ab558d81a450c1bea1c00f41b084bc83e3f' 
  AND token = 'b6G4Qf4fNA2Ee9E2mGV5XEAY5NC+x8AyXVFjv8gPLB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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