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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679a08d336389a768f14bd4ad2292c46897450e7cbdeaa2bb71887af01c026aa' 
  AND token = '7zjwHNQKpehoSy4nNT6mPfnjZoSPbj4gZdGYQfLuU78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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