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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962f45bcf6a59077a2a7a35b90bb93f7e5a03f26668d2f6bf128fff5c6e15aa6' 
  AND token = 'ncH3yrp++trJlcO6YxpEV/2A5Vj4sLosR4m2qmaEuAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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