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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a067df99ca9d981cd5b0d7a89f50cdf9040b898bdda36495381d7e41996d31' 
  AND token = 'EPg+wD0UpHxjmT39/h8yl/eWF+yH8mL3POUWkNVqAbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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