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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f542f17fbc44fbf3bd2ed38e1d54bda4f0fdfbcd3018c13b54d9c4804d0dca01' 
  AND token = 'K39POdT2IhC0GYbvCeImJpyTn7D0X6GVb6zvtPhdIwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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