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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae182af0746ffa5c4bb5ca7848687cab2e673060f8ebc6f45950c23aae6d443b' 
  AND token = 'fs2nesCrp27MMwZJiXpRvt0E9T+qVL4WWYWQR7sxbrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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