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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e7d755e6a6776a3cd096070eda3c815d16560443b52d86bdd787d31416fa38' 
  AND token = '/+ZMSfS59Vkdv1baUu12ygayoo636Ylir7pWtjQYXM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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