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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6610b3801bbb66875dc4c5c5c7bb6c6b98db6d21094b183bdfe80971c9cf5d77' 
  AND token = '5Zm4oFl9MH8IRmhpY/ZD/t5FyM/lUQVZsxoTFm7wPhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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