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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0870bacd027edbff8810455f0207574875c68252c888403b5502187b1998b57e' 
  AND token = '9pNmRnzBGvoRPT657YgdwDsf60BHSEY0UvhUbn2fjh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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