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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2634bba6578cc2868241e3f3808338d321ea8658188083a43f7abb5df11a675' 
  AND token = 'T8H5lGy/Gi2f0X0F8tCvXomFmnHYEqetbBiUi4ji/NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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