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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9184a19e6d6e46f23782aa3a536e7aa3044230972685d3ade6bf216d675bb0c0' 
  AND token = 'XoRwlUa+Og5OmpqSoxtlr7MNH6ao/Eq87l4IkRbQvpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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