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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c94d1f566565130c9c9004e6c64f98c1286238b4d7edd3a82147ca5b6a9e3cc4' 
  AND token = 'fv+PR7/OCAyAXQlrxmI60oJROTOlikk/ajT5/9PYIAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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