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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ef0abc33030fa82e437f6c380d51d203178506591decfab2c5599ecc298da4' 
  AND token = '82U63uWbRtd33jJ1JLiMIiMG7FOV3HAoGcZoL+fRrHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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