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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb1a120c0dc4526203a81d1dcc40c80d4e430c721138a4810db179f2c5e1c91' 
  AND token = 'XQHtFjvtY/4BGVxsMhtJUpYjk1LQCr6p8J3mFun2aAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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