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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38550c34eef11049d355afc031b9a88f69149e86227571c4b77950d5028ae53' 
  AND token = '/G5gLYRM14rU7yeKGXKZoCGWCha5IlMANm1VJU4y5Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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