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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131733c624df2a26962284d57ccc59a590920ed8ab81fed44403328666469216' 
  AND token = '1g/yP1e7FJokEnIw3yOapQfV7UscvPixkcVYmSq9Df4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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