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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c0d4b374ff9eb5d738762caa9ec8fe73b2b1939183fbc8330639262d72bfbb' 
  AND token = 'XwL5mSc0GyWW2HZleRWPPU5Wk6hMbH1H154fURSQ9XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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