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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77ebfefbebf40413646e66feec063ab1bcc26b53bb92e6e0660111bcf2b2efa' 
  AND token = 'muw3O+B4o5bVVLsvc1ttN1KLPLov6gFw69D6veMC1Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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