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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8d357d7aa1576f23b0d8f296d1a6cdddc582b6fdfffe64f2761160e7601e24' 
  AND token = '74CHIekYO3MLUuhst2fDutIixu3oK4i5SDa3Xuu31A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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