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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19480da9842ddb7e8800650238c0430f6f09c44771d6e3de89054fc8892fa93e' 
  AND token = '3q6rukhDo0SkuZA6UgvR3dzr1c2D8l+alA/OlSYR78w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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