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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac44d627ec7e5e9e593c804b0dfe54ace297f113c28fdfa3f4c6021ef742ed0e' 
  AND token = 'GzbsSIhXG4fZkz+IMWirnOvbV1DeFaPvQiF8gIXwRRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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