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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee2010a45a87d98fc712b3955be84297b076e41cd0f1525fbe679bdf5eb7db3' 
  AND token = 'kDCY9hv9uwWVh8d7SMG5RDR73MGqBBWc7uEpFgHWqw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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