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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089556c7321e6b8a8106ab00ae623ea7c466de513bb49e55d1ce52999870acd4' 
  AND token = 'G8vXTzp58yL3aEnUq3BIe6aI4LPzm4pmLrqwqva5d2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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