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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abe129516b1d1badb3be0fad8cba735a17f7cc00556a984738c06365b94b8d05' 
  AND token = 'hoQTMzna85XEv9OHC3FaT2rqzXerpWqMNFQLpSpJ0ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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