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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee46779afd223c32c02f2a3dfeac7bc717590c95a3ce02a8787c99001f24a6e' 
  AND token = '4xAQAN6rzjeTvuYo2V+C9pINRZKKu+P9vmWwCrpXCqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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