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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f791bef33b5d24b989a0560573d0f936f07ef77ecab19b10b06ca1c39ad325' 
  AND token = '9mpR99EubDR5lq7ZIjyOsP0/FnO/hzhweN/uBZu6eM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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