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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9be0d7e82990c4f9cc7fe8ce5dfe35c9073b98c2425c21750e847075a87252' 
  AND token = '3hoewIy4JstJJsyBL+M6wug2VEuJd8QhQSsywm6jRqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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