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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01eeba7bf2c23b36cf902bdc5d509980b13592e2024f6985d803f3052b8facb3' 
  AND token = 'CsRAULp+b1sGplAqn0ciUYKgo7OnA2v+uocFzqPRPEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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