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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246c899812a0bb47fb5e4dba9dd98f8d039b4e9145bb1c88fb824d460d2e8404' 
  AND token = '/OzWQ9JJvGFGZoczKZGW9xTCAyNej6K1EHFTDIZl8KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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