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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea5db74332dfa9210ea76488fdf7df97393c9d876ada28cc49ef72af51ebb7b' 
  AND token = 'WCTOAQsZoSt+Am6EPKIVo/V6A3eqM7Mc9yPQ2l7OHtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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