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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb64a343b8d5108906a81d2c2f18ddf3f90a56e6f232062701aebacb7065c055' 
  AND token = '6dirsuosG2NNH8xO3GrzdW0I1LTktkbQHzQth/FnoXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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