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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a55d3482e31416cbf2ffb91e2e68c5ed1ca4296107e324cb172e18dc47215bd' 
  AND token = 'Rn1v+G/wpWK+ndCFlzAF16wnxzQmZiB66JMup12Ddt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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