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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1005d9eb6d2b5c1ff2a7507654afcaae8243df6c2847c9e005f24b1fdeff5c6' 
  AND token = 'iE5HiaM62JYSkrCzFPqiW7fo9nayEzHK5a1jV1c12t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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