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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802c16d2cec7ba588905abb8667e51d4a15c811c906ba1a753803cd8ae366629' 
  AND token = 'y8NzR6SPEFbmbmNkZjhHggtP/97KBy34/y51vHA1b2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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