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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8e7ff552b3415a15f28f75a398902866befd0868359382a52e23268cde13e1' 
  AND token = 'xW3f/0227o1W0Dx72/7xEFpLbMe+sEterPmcXR3XC1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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