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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f151f83754a44369d34b80439ea217ffb8dda87ce3cebcccba5b877bcbde13be' 
  AND token = 'W5nge1A9IHvLnnpqyQgFD53IfLPEG/uLJRM6IAj4RL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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