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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11dca79deb4f8c1cfb686c13d69c7a9bfd381aa25333891d030bc695a961d4e6' 
  AND token = 'DasGJPQc9T3650z3PeScMFd8iB9IXg8x/LTHuqWu1a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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