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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b751f4a67dd5e883551d766164604dffbe1fb3c0047b100c51002dc90eda013b' 
  AND token = 'X8BHFL7exprOKLQNDcYxAmhS3K+bWEmFkMBomPJ8rPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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