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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5131065bd608ae615f3482624d27d2e82509be208d5de9d54d6fbdd4f6aa92ed' 
  AND token = '+eCxVD9bf2jVjIj08UkXG7k1WShnkXehQpnJ9Dl+kIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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