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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '526de12cf494e11dbdfdce74bf4ff98c5d495d5dcb17492215b60d9f17bcd61e' 
  AND token = '8IGDbFp++K7kOKKa6pIqVNH4MmsP9qANtassrH3gDYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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