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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7467ea71698db961bc4fb45e9a56bfde195d69bd80b55c250d3b5eb31cec784e' 
  AND token = 'm0s8K26qAmEjN0I9itL2kQRe1hgcGOgSC717wqnrD+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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