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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e66a1b43db86d90c0ccab2b306d32a5a2e4e356dc86e030e641f1f2d64d5567' 
  AND token = '8FrHR6ZhzW2o02jz/4OR/gpu0Z6EeoxNjeTu7183L6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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