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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7584a0de3916b693308eb6b72aa04b4bc76b7be6449c27dc11c8f5b3c3ed52b' 
  AND token = 'WD//zOFHDllRZvb+qrzGbakeZxtlcoOttD4k1qat6yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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