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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31c9b985ce4088ca84079aba16dd7b0d0c3819d0a716f0f50c62cb93b5ffe37' 
  AND token = 'Hpgs9cDug8yWyGBNaqNugvYTo6dcYQwl3/UnftE2d0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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