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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fbcccd28e3d0f29b73c330ecb30730a1ffae82f7d3ebdb7691b0f5d04ed2df' 
  AND token = '4Whls+6CLJI+McIQVVah+e/a+yR6ymjzV2ve3GiDJO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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