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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a9f7c7a819179ec612d1a33c5dff483d03c54709a2e6aad9a6a26dfd8420d7' 
  AND token = 'e/+Qj4+YnzepUNH7dKdzXAiMgucrXL9xmqnti1JViiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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