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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f82aaa79eb22274cee0cc87bcb5d30387d4f6c708374c21f4d9dfe7a179d34c' 
  AND token = 'J3NhpY0qDICiWmScfKgqTNRB1dC+coMfwMvj9ftSeQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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